Apparently, the Japanese manual for the Wii is ridiculously detailed and ultra-safe: don't choke yourself with the nunchuk cable, don't pour オレンジ soda into your Wii, don't swaddle your Wii in blankets like a baby...
The ウォール 通り, ストリート Journal has reported cases of numb arms, sore shoulders, and the dreaded "Wii-elbow," all caused によって jerky または repetitive motions from overuse of Nintendo's new Wii console.